<template>
  <el-col v-if="widget.type === 'grid-col'" class="grid-cell" v-bind="layoutProps"
          :class="[selected ? 'selected' : '', customClass]" :style="colHeightStyle"
          :key="widget.id" @click.native.stop="selectWidget(widget)">
    <draggable :list="widget.widgetList" v-bind="{group:'dragGroup', ghostClass: 'ghost',animation: 200}"
               handle=".drag-handler" @end="(evt) => onGridDragEnd(evt, widget.widgetList)"
               @add="(evt) => onGridDragAdd(evt, widget.widgetList)"
               @update="onGridDragUpdate" :move="checkContainerMove">
      <transition-group name="fade" tag="div" class="form-widget-list">
        <template v-for="(subWidget, swIdx) in widget.widgetList">
          <template v-if="'container' === subWidget.category">
            <component :is="subWidget.type + '-widget'" :widget="subWidget" :designer="designer" :key="subWidget.id" :parent-list="widget.widgetList"
                              :index-of-parent-list="swIdx" :parent-widget="widget"></component>
          </template>
          <template v-else>
            <component :is="subWidget.type + '-widget'" :field="subWidget" :designer="designer" :key="subWidget.id" :parent-list="widget.widgetList"
                          :index-of-parent-list="swIdx" :parent-widget="widget" :design-state="true"></component>
          </template>
        </template>
      </transition-group>
    </draggable>

    <div class="grid-col-action" v-if="designer.selectedId === widget.id && widget.type === 'grid-col'">
      <i class="el-icon-back" :title="i18nt('designer.hint.selectParentWidget')"
         @click.stop="selectParentWidget(widget)"></i>
      <i class="el-icon-top" v-if="!!parentList && (parentList.length > 1)" :title="i18nt('designer.hint.moveUpWidget')"
         @click.stop="moveUpWidget()"></i>
      <i class="el-icon-bottom" v-if="!!parentList && (parentList.length > 1)" :title="i18nt('designer.hint.moveDownWidget')"
         @click.stop="moveDownWidget()"></i>
      <i class="el-icon-copy-document" :title="i18nt('designer.hint.cloneWidget')" @click.stop="cloneGridCol(widget)"></i>
      <i class="el-icon-delete" :title="i18nt('designer.hint.remove')" @click.stop="removeWidget"></i>
    </div>

    <div class="grid-col-handler" v-if="designer.selectedId === widget.id && widget.type === 'grid-col'">
      <i>{{i18nt('designer.widgetLabel.' + widget.type)}}</i>
    </div>
  </el-col>
</template>

<script>
import Draggable from 'vuedraggable'
import i18n from '@/views/lowcode/utils/i18n'
import FieldComponents from '@/views/lowcode/components/form-designer/form-widget/field-widget/index'
import refMixinDesign from '@/views/lowcode/components/form-designer/refMixinDesign'

export default {
  name: 'GridColWidget',
  componentName: 'GridColWidget',
  mixins: [i18n, refMixinDesign],
  inject: ['refList'],
  components: {
    Draggable,
    ...FieldComponents
  },
  props: {
    widget: Object,
    parentWidget: Object,
    parentList: Array,
    indexOfParentList: Number,
    designer: Object,

    colHeight: {
      type: String,
      default: null
    }

  },
  data () {
    return {
      layoutProps: {
        span: this.widget.options.span || 12,
        // md: this.widget.options.md || 12,
        // sm: this.widget.options.sm || 12,
        // xs: this.widget.options.xs || 12,
        offset: this.widget.options.offset || 0,
        push: this.widget.options.push || 0,
        pull: this.widget.options.pull || 0
      }
    }
  },
  computed: {
    selected () {
      return this.widget.id === this.designer.selectedId
    },

    customClass () {
      return this.widget.options.customClass || ''
    },

    colHeightStyle () {
      return this.colHeight ? { height: this.colHeight + 'px' } : {}
    }

  },
  watch: {
    'designer.formConfig.layoutType': {
      handler (val) {
        if (this.widget.options.responsive) {
          if (val === 'H5') {
            this.layoutProps.span = this.widget.options.xs || 12
          } else if (val === 'Pad') {
            this.layoutProps.span = this.widget.options.sm || 12
          } else {
            this.layoutProps.span = this.widget.options.md || 12
          }
        } else {
          this.layoutProps.span = this.widget.options.span || 12
        }
      }
    },

    'widget.options.responsive': {
      handler (val) {
        let lyType = this.designer.formConfig.layoutType
        if (val) {
          if (lyType === 'H5') {
            this.layoutProps.span = this.widget.options.xs || 12
          } else if (lyType === 'Pad') {
            this.layoutProps.span = this.widget.options.sm || 12
          } else {
            this.layoutProps.span = this.widget.options.md || 12
          }
        } else {
          this.layoutProps.span = this.widget.options.span || 12
        }
      }
    },

    'widget.options.span': {
      handler (val) {
        this.layoutProps.span = val
      }
    },

    'widget.options.md': {
      handler (val) {
        this.layoutProps.span = val
      }
    },

    'widget.options.sm': {
      handler (val) {
        this.layoutProps.span = val
      }
    },

    'widget.options.xs': {
      handler (val) {
        this.layoutProps.span = val
      }
    },

    'widget.options.offset': {
      handler (val) {
        this.layoutProps.offset = val
      }
    },

    'widget.options.push': {
      handler (val) {
        this.layoutProps.push = val
      }
    },

    'widget.options.pull': {
      handler (val) {
        this.layoutProps.pull = val
      }
    }

  },
  created () {
    this.initRefList()
    this.initLayoutProps()
  },
  methods: {
    initLayoutProps () {
      if (this.widget.options.responsive) {
        let lyType = this.designer.formConfig.layoutType
        if (lyType === 'H5') {
          this.layoutProps.span = this.widget.options.xs || 12
        } else if (lyType === 'Pad') {
          this.layoutProps.span = this.widget.options.sm || 12
        } else {
          this.layoutProps.span = this.widget.options.md || 12
        }
      } else {
        this.layoutProps.spn = this.widget.options.span
      }
    },

    onGridDragEnd (evt, subList) {
      //
    },

    onGridDragAdd (evt, subList) {
      const newIndex = evt.newIndex
      if (subList[newIndex]) {
        this.designer.setSelected(subList[newIndex])
      }

      this.designer.emitHistoryChange()
      this.designer.emitEvent('field-selected', this.widget)
    },

    onGridDragUpdate () {
      this.designer.emitHistoryChange()
    },

    selectWidget (widget) {
      console.log('id: ' + widget.id)
      this.designer.setSelected(widget)
    },

    checkContainerMove (evt) {
      return this.designer.checkWidgetMove(evt)
    },

    selectParentWidget () {
      if (this.parentWidget) {
        this.designer.setSelected(this.parentWidget)
      } else {
        this.designer.clearSelected()
      }
    },

    moveUpWidget () {
      this.designer.moveUpWidget(this.parentList, this.indexOfParentList)
    },

    moveDownWidget () {
      this.designer.moveDownWidget(this.parentList, this.indexOfParentList)
    },

    cloneGridCol (widget) {
      this.designer.cloneGridCol(widget, this.parentWidget)
    },

    removeWidget () {
      if (this.parentList) {
        let nextSelected = null
        if (this.parentList.length === 1) {
          if (this.parentWidget) {
            nextSelected = this.parentWidget
          }
        } else if (this.parentList.length === (1 + this.indexOfParentList)) {
          nextSelected = this.parentList[this.indexOfParentList - 1]
        } else {
          nextSelected = this.parentList[this.indexOfParentList + 1]
        }

        this.$nextTick(() => {
          this.parentList.splice(this.indexOfParentList, 1)
          // if (!!nextSelected) {
          this.designer.setSelected(nextSelected)
          // }

          this.designer.emitHistoryChange()
        })
      }
    }

  }
}
</script>

<style lang="scss" scoped>
  .grid-cell {
    min-height: 38px;
    //margin: 6px 0;  /* 设置了margin，栅格列的offset、push、pull会失效！！ */
    padding: 3px;
    outline: 1px dashed #336699;
    position: relative;

    .form-widget-list {
      min-height: 28px;
    }

    .grid-col-action{
      position: absolute;
      bottom: 0;
      right: -2px;
      height: 28px;
      line-height: 28px;
      background: $--color-primary;
      z-index: 999;

      i {
        font-size: 14px;
        color: #fff;
        margin: 0 5px;
        cursor: pointer;
      }
    }

    .grid-col-handler {
      position: absolute;
      top: -2px;
      left: -2px;
      height: 22px;
      line-height: 22px;
      background: $--color-primary;
      z-index: 9;

      i {
        font-size: 14px;
        font-style: normal;
        color: #fff;
        margin: 4px;
        cursor: default;
      }
    }
  }
</style>
